$F0A4/61604: Serial Bus Idle
Jump from $ED0E, $F88A:
F0A4: 48 PHA
F0A5: AD A1 02 LDA $02A1 ; RS232 Enables
F0A8: F0 11 BEQ $F0BB
Jump from $F0AF:
F0AA: AD A1 02 LDA $02A1 ; RS232 Enables
F0AD: 29 03 AND #$03
F0AF: D0 F9 BNE $F0AA
F0B1: A9 10 LDA #$10
F0B3: 8D 0D DD STA $DD0D ; CIA2: Interrupt (NMI) Control Register
F0B6: A9 00 LDA #$00
F0B8: 8D A1 02 STA $02A1 ; RS232 Enables
Jump from $F0A8:
F0BB: 68 PLA
F0BC: 60 RTS
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